3M
™
Multi-Touch
PCT System
Integration Guide
For Projected Capacitive Technology (PCT) Systems
Please read, understand, and follow all safety information contained in these
instructions prior to the use of this 3M Multi-Touch PCT System.
Retain these instructions for future reference.
3M™ Multi-Touch PCT System Integration Guide 2
The information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any
form or by any means, electronic or mechanical, for any purpose, without the express written permission of 3M Touch Systems, Inc. 3M
may have patents or pending patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in
this document. The furnishing of this document does not give you license to these patents, trademarks, copyrights, or other intellectual
property except as expressly provided in any written license agreement from 3M Touch Systems, Inc.
The information provided in this document is intended as a guide only. For the latest detailed engineering specifications, please contact
your 3M Touch Systems, Inc. Application Engineer. 3M Touch Systems, Inc. is committed to continually improving product designs. As a
result, product specifications may be subject to change without notification.
"RoHS 2011/65/EU" means that the product or part does not contain any of the substances in excess of the maximum concentration
values (“MCVs”) in EU RoHS Directive 2011/65/EU, unless the substance is in an application that is exempt under EU RoHS. The MCVs are
by weight in homogeneous materials. This information represents 3M's knowledge and belief, which may be based in whole or in part on
information provided by third party suppliers to 3M.
NOTICE: Given the variety of factors that can affect the use and performance of a 3M Touch Systems, Inc. product (the “Product”),
including that solid state equipment has operation characteristics different from electromechanical equipment, some of which factors are
uniquely within User’s knowledge and control, it is essential that User evaluate the 3M Touch Systems, Inc. Product and software to
determine whether it is suitable for User’s particular purpose and suitable for User’s method of application. 3M Touch Systems, Inc.
statements, engineering/technical information, and recommendations are provided for User’s convenience, but their accuracy or
completeness is not warranted. 3M Touch Systems, Inc. products and software are not specifically designed for use in medical devices as
defined by United States federal law. 3M Touch Systems, Inc. products and software should not be used in such applications without 3M
Touch Systems, Inc. express written consent. User should contact its sales representative if User’s opportunity involves a medical device
application.
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software are warranted to meet their published specifications from the date of shipment and for the period stated in the specification.
3M Touch Systems, Inc. makes no additional warranties, express or implied, including but not limited to any implied warranties of
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software are fit for User’s particular purpose and suitable for its method of production, including intellectual property liability for User's
application. If the Product, software or software media is proven not to have met 3M Touch Systems, Inc. warranty, then 3M Touch
Systems, Inc. sole obligation and User’s and Purchaser’s exclusive remedy, will be, at 3M Touch Systems, Inc. option, to repair or replace
that Product quantity or software media or to refund its purchase price. 3M Touch Systems, Inc. has no obligation under 3M Touch
Systems, Inc. warranty for any Product, software or software media that has been modified or damaged through misuse, accident,
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shall not be liable in any action against it in any way related to the Products or software for any loss or damages, whether non-
specified direct, indirect, special, incidental or consequential (including downtime, loss of profits or goodwill) regardless of the legal
theory asserted.
© 3M 2016 All rights reserved.
Document Title: 3M
TM
Multi-Touch PCT System Integration Guide
Document Number: TSD-48194, Revision F
3M, the 3M logo, and VHB, are trademarks of 3M Company in the United States and/or other countries.
Windows and/or other Microsoft products referenced herein are either registered trademarks or trademarks of Microsoft Corporation in
the U.S. and/or other countries.
Snowman marker is a registered trademark of Seiko Seisakusho Co. Ltd.
All other trademarks are the property of their respective owners.
3M™ Multi-Touch PCT System Integration Guide 3
Contents
Contents
About This Manual
What You Need to Know .......................................................................................... 5
3M Touch Systems Support Services ........................................................................ 5
Contact 3M Touch Systems ....................................................................................... 6
Chapter 1
Getting Started
Important Safety Information .................................................................................... 7
Installation Warnings and Safety Precautions ........................................................... 9
Supplies and Tools Needed for the Installation ....................................................... 10
Supplies Needed ...................................................................................................... 10
Tools Needed ........................................................................................................... 10
Touch Sensor Care and Cleaning ............................................................................ 10
Preparing Your Work Space .................................................................................... 11
Comfortable Work Area .......................................................................................... 11
ESD Workbench ...................................................................................................... 11
Protective Material .................................................................................................. 11
Foam Pad ................................................................................................................. 12
Identifying the Components ..................................................................................... 12
Important Notes for Video Displays ........................................................................ 12
Testing the Display Video ....................................................................................... 13
Summary of the Installation Procedure ................................................................... 13
Chapter 2
System Design Considerations
Electrical Considerations ......................................................................................... 18
LCDs ........................................................................................................................ 19
Emissions ................................................................................................................. 19
Mechanical Considerations...................................................................................... 19
Tail Routing ............................................................................................................. 19
Touch System Location ........................................................................................... 20
Multi-Touch Application Support ........................................................................... 21
Designing Software Applications ............................................................................ 21
3M™ Multi-Touch PCT System Integration Guide 4
Chapter 3
Installing a 3M Multi-Touch PCT Sensor
Installation Considerations ...................................................................................... 22
Touch Sensor Care and Cleaning ............................................................................ 23
Flex Cable Cleaning ................................................................................................ 24
Attaching the Touch Sensor to the Display ............................................................. 25
Inspect the Mounted Touch Sensor ......................................................................... 27
Repair or Removing the Touch Sensor (if needed) ................................................. 27
Chapter 4
Installing the 3M Multi-Touch Controller PX Series
3M PX Series Controller ......................................................................................... 28
Mounting the Controller Internally .......................................................................... 29
Completing Controller Mounting ............................................................................ 29
Connecting the Touch Sensor .................................................................................. 30
Troubleshooting ....................................................................................................... 32
Establishing the Data Connection ............................................................................ 32
USB Connection ...................................................................................................... 32
Extension Cables and Extension Boards ................................................................. 33
Powering the Controller ........................................................................................... 35
Chapter 5
Enabling Your 3M Multi-Touch PCT System
Microsoft Windows® Compatibility ....................................................................... 36
All Other Platforms.................................................................................................. 36
Multi-Touch Application Support ........................................................................... 36
Video Alignment ..................................................................................................... 36
How to Test Alignment ........................................................................................... 38
3M™ Multi-Touch PCT System Integration Guide 5
About This Manual
Congratulations on the purchase of your 3M™ Multi-Touch PCT System. The PCT System
incorporates 3M projected capacitive touch technology (3M PCT) and offers full multi-touch
capabilities -- a must-have for next-generation, multi-touch applications.
The 3M Multi-Touch PCT System provides customers with a leading edge solution that supports
simultaneous touch events while rejecting palm events. It also includes a non-active, chemically
strengthened cover glass which protects the underlying conductive elements as well as making
it functionally impervious to surface scratches. The flat front surface solution virtually
eliminates dust and debris buildup at the edges of the display and helps increase system
reliability.
Refer to information later in this guide for more details on your touch system. All other
technical documentation is available from the 3M Touch Systems website at
www.3m.com/touch.
What You Need to Know
This manual describes how to complete the following tasks:
• Disassemble your display (if necessary)
• Mount the sensor to the display
• Install the touch controller
3M Touch Systems Support Services
3M Touch Systems provides extensive support services through our website and technical
support organization. Visit the 3M Touch Systems website at www.3m.com/touch, where you
can download touch software and drivers, obtain regularly updated technical documentation on
3M Products, and learn more about our company.
Whenever you contact Technical Support, please provide the following information:
• Display size, part number and serial number
• Current driver version
• Operating system used
• Information on additional peripherals
Technical Support is available Monday through Friday 8:30 a.m. to 5:30 p.m. with limited call
back service after 5:30 p.m. until 8:00 p.m. US Eastern Standard Time – 9 a.m. to 5 p.m.
3M™ Multi-Touch PCT System Integration Guide 6
throughout Europe.
You can contact 3M Touch Systems Technical Support (US only -- Eastern Standard Time) by
calling the hot line, sending email or a fax.
• Technical Support Hot Line: 978-659-9200
• Technical Support Fax: 978-659-9400
• Toll Free: 1-866-407-6666 (Option 3)
• Email: US-TS-techsupport@mmm.com
Contact 3M Touch Systems
Contact information for all offices can be found on our website at: www.3m.com/touch
3M™ Multi-Touch PCT System Integration Guide 7
CHAPTER 1
Getting Started
The 3M Multi-Touch PCT System can help you transform the human-computer interface
experience. To begin installing your 3M PCT System, take a few minutes to review this chapter.
It is your roadmap to a successful installation. This manual describes how to retrofit a display
with a touch sensor and controller. However, the principles apply equally well to systems
integrated with sensors at an OEM level.
• The illustrations in this guide are representative of the components you will be installing. For
precise layout and detailed dimensions, refer to the marketing drawings supplied by your
sales representative.
• Pay close attention to the installation warnings and safety precautions. Disassembling a
display can be a dangerous procedure. Be sure to follow all manufacturers' recommendations
for assembly and disassembly of your flat panel display.
• Make sure you have the necessary equipment before starting the installation. Refer to
Supplies and Tools Needed for the Installation later in this chapter.
• Set up a clean, comfortable, and spacious working area. Having sufficient room to work
makes the installation easier.
• Test your display to ensure good working condition before you install the sensor.
• Identify the different components to install and review the summary of the installation
procedure. It is important to know how all the pieces eventually fit together before
disassembling your system.
Note: If any points within this guide are unclear to you, or further clarification is necessary,
please contact your 3M Touch Systems representative.
Important Safety Information
Read and understand all safety information before using this product. Follow all instructions
marked on the Product and described in this document. Pay close attention to the following
installation warnings and safety precautions.
3M™ Multi-Touch PCT System Integration Guide 8
Intended Use
The 3M PCT Systems are designed for adding touch input functionality to an existing display. These
kits are intended for professional integration and use in an indoor environment. They are not
designed or tested for use in hazardous locations. Use in any other application has not been
evaluated by 3M and may lead to an unsafe condition.
Explanation of Signal Word Consequences
WARNING: Indicates a hazardous situation which, if not avoided, could result in
serious injury or death
CAUTION: Indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury and/or property damage.
NOTICE: Indicates a situation which, if not avoided, could result in property
damage.
WARNING
• To reduce the risks associated with hazardous voltage:
- Do not install without Product documentation
- Do not attempt installation without appropriate experience in display assembly/disassembly.
- Connect DC power to controller using appropriate grounded power source.
- Do not use non-conforming or damaged replacement parts, or parts not supplied by 3M.
• To reduce the risks associated with fire:
- When using any cleaning solution, follow all instructions and recommendations in the
manufacturer's Safety Data Sheet and on Product label.
• To reduce the risks associated with sharps:
- Ensure appropriate protective eyewear is worn during the integration process.
3M™ Multi-Touch PCT System Integration Guide 9
Dispose components in accordance with all applicable local and governmental regulations.
Installation Warnings and Safety Precautions
3M Touch Systems recommends that only qualified display technicians install the touch sensor
for the following reasons:
• Due to the risk of injuring yourself
• Due to the danger of hazardous voltages present in the display
• Due to the risk of accidentally damaging the sensor
• Due to the risk of altering the LCD’s critical circuits
If you decide to install the sensor, take the following precautions:
CAUTION
• To reduce the risks associated with sharps:
- Sensor edges could be sharp.
- Handle the sensors with care to avoid breaking the glass.
• To reduce the risks associated with lifting heavy touch screens:
- Use two-person lift or material handling equipment during handling and integration process for
systems 32” or greater in size.
NOTICE
• To reduce the risk of property damage to the PCT system:
- Consult the Controller Reference Guide to properly identify the pin-out of the power connector
to the controller
- Electronic controller and ASIC should only be removed from its ESD protective packaging and
handled at an ESD station.
- Do not contact the back surface of the touch screen and use only deionized, filtered air for
cleaning.
- You must provide a path for electrostatic discharge. The controller mounting hole nearest the
sensor connector should be used to connect to chassis safety ground and must be attached by
the shortest possible route to a good earth return (chassis) in all applications.
3M™ Multi-Touch PCT System Integration Guide 10
• Follow each procedure carefully, work with the system powered off and unplugged, and
observe all warnings.
• Protect your investment. The sensor is a glass product. You must handle it with care.
• Take precautions to not damage the edges of the sensor as cracks can propagate into the
viewing area.
Note: Consult the display manufacturer to find out whether the original warranty will be
affected if you install the sensor. Also, determine who will recertify the display. Certification will
be necessary to comply with safety and EMC/EMI regulations.
Supplies and Tools Needed for the Installation
Before starting the installation procedure, check that you have all items listed below.
Supplies Needed
• Safety glasses
• Clean, anti-static pad
• Small containers for holding loose
parts
• Foam pad (optional)
• Gloves
• Electrical tape (or black acetate tape)
• Felt-tip marker pen
• Clean soft cloth and glass cleaner for
the display and touch sensor
• Cable tie-wraps
• Lead-free solder (RoHS compliant)
• Replacement screws for mounting flat
panel to bezel or chassis
• Ring lugs or crimps
• Nylon spacers and washers
• Polyimide tape
• Bezel Sealing tape – Test for
suitability in your system
• Mounting tape -- closed cell acrylic
foam tape or 3M VHB™
Conformable Tape 59xx (double
sided adhesive)
Tools Needed
• Flat-blade screwdriver with insulated
handle
• Phillips head screwdriver
• Soldering iron
• Razor knife or single edge razor blade
• Wire stripper
• Center punch
• Power drill
• Ionized Compressed air
• Variety of drill, tap, and spade bits
• Dremel® tool or nibbler
Touch Sensor Care and Cleaning
The sensor requires very little maintenance. 3M Touch Systems recommends that you
periodically clean the glass sensor surface.
3M™ Multi-Touch PCT System Integration Guide 11
Typically, an isopropyl alcohol and water solution ratio of 50:50 is the best cleaning agent for
your sensor. Do not use straight isopropyl alcohol. Be sure to follow solvent manufacturer's
precautions and directions for use when using any solvents.
• It is important to avoid using any corrosive or caustic chemicals on the sensor.
• Always dampen the cloth and then clean the sensor. Be sure to spray the cleaning liquid onto
the cloth, not the sensor, so that drips do not seep inside the display or stain the bezel.
• Apply the cleaner with a soft, lint-free cloth. Avoid using gritty cloths.
• Always handle the sensor with care. Do not pull on or stress flex tails.
• Use the recommended cleaner and a soft, lint free cloth to clean the sensor. Make sure the
glass is clean and dry before you attach the sensor.
• Clean only the front surface of the sensor. Only remove the protective liner from the touch
sensor just prior to placing it on the LCD.
Note: Do not clean the backside of the sensor; the surface can be easily scratched. If you need
to remove any debris from the sensor, use a filtered ionized air source. If you do happen to
scratch the black border, we recommend using a Snowman brand black paint marker to touch
up any small scratches.
Preparing Your Work Space
Comfortable Work Area
Select a comfortable work area with adequate space and lighting. Make sure that the area is
free of clutter and/or objects that could scratch the touch sensor and display. Leave the
protective films in place as long as possible. 3M Touch Systems recommends a work area (sq ft)
of at least three times the size of your display.
ESD Workbench
A certified ESD workbench is strongly recommended when working with these electronics
assemblies.
Protective Material
Place anti-static protective material on the work surface. A padded surface protects equipment
from scratches during installation.
3M™ Multi-Touch PCT System Integration Guide 12
Foam Pad
An ESD conductive foam pad is useful for holding the display while attaching the touch sensor.
The pad makes the sensor easier to rotate for fastening screws, taping, etc.
Identifying the Components
The following components are needed for a successful integration:
• A PCT touch sensor
• A PX5nnn ASIC controller
• A USB cable or serial cable
• Software and technical documentation found on the web at www.3m.com/touch.
Save the invoice, shipping container, and all packing material in case you need to transport the
equipment any time in the future.
Important Notes for Video Displays
• In extreme temperature and humidity situations, you may observe condensation between the
touch screen and the display. To minimize this condition, place the unit where it will be used
and allow a 24-hour environmental stabilization period prior to powering on the display. Any
noticeable condensation is temporary and will have no long term affect on the operation of
the display.
• You are cautioned that any change or modification to the equipment not expressly approved
by the party responsible for compliance could void your authority to operate such equipment.
• When unplugging the power supply cord, hold the plug, do not pull by the cord.
• Do not connect or disconnect this Product during an electrical storm.
RS232
or USB
CPU
Video
Adapter
Software
Power Supply
Power Supply
Display
Touch Screen
Firmware
Controller
3M™ Multi-Touch PCT System Integration Guide 13
• Remember to take into account that the operating temperature of the installation may be
greater than the room ambient, and consideration should be given to installing the unit in an
environment compatible with the maximum rated operating temperature.
• When installing the unit, ensure that it does not restrict the flow of air to any other
equipment within the installation required for safe operation.
• Install the display in a well-ventilated area. Always maintain adequate ventilation to protect
the display from overheating and to ensure reliable and continued operation.
• Do not expose this display to direct sunlight or heat. Passive heat may cause damage to the
housing and other parts.
• Ensure the metal enclosure does not contact the touch sensor.
• Be sure to gasket the display to its enclosure properly to prevent damage to the touch sensor.
• To avoid ergonomic concerns:
Do not install the display in a manner or location with awkward accessibility.
Extended use may result in muscle, tendon, or fixed posture strains. It is recommended you
take periodic breaks from continuous use.
• Plug power cord into an appropriate power source.
• Plug power cord into a grounded receptacle.
• The 3M touch controllers mentioned in this document, are USB compatible full speed
devices.
• 3M does not warrant that we are USB compliant pursuant to USB specifications.
Testing the Display Video
Whether you are installing the touch sensor on a new or older display, you should make sure
that the display is in good working condition and the video output is functioning properly. Your
initial test should verify that the video functions properly before you install the sensor. You can
also compare your results with the results you get after you complete the installation.
If the display is functioning properly, turn off your system, disconnect power plugs, and
disconnect all cables from the display. You are ready to disassemble the display and install the
sensor.
Summary of the Installation Procedure
You can install a 3M Multi-Touch Sensor on a display. Although each particular display may have
some unique integration considerations, the basic installation process consists of the following
steps:
• Test that the display’s video works properly
• Disassemble the display (if necessary)
• Mount the sensor to the front of the LCD panel
• Install the controller
• Connect flex cables to controller
• Reassemble the display and connect to your computer system.
3M™ Multi-Touch PCT System Integration Guide 14
Flex Cable Bend
VHB
Sensor
Glass
Sensor
Film
LCD
Flex
Cable
Flat Front Surface (Side View)
Tray
3M™ Multi-Touch PCT System Integration Guide 15
Exploded View of Integration
Bezel
3M™ Multi-Touch PCT System Integration Guide 16
Exploded View of Integration
Flat Front Surface
3M™ Multi-Touch PCT System Integration Guide 17
Detailed View of Cable
Routing and Controller Installation
(Rear View)
3M™ Multi-Touch PCT System Integration Guide 18
CHAPTER 2
System Design Considerations
Electrical Considerations
The front surfaces of displays carry potentials that fluctuate at the fundamental and harmonics
of display scan frequencies. The 3M Multi-Touch Controllers PX Series operate at a fixed
frequency selected for best touch operation.
3M™ Multi-Touch PCT System Integration Guide 19
LCDs
In a projected capacitive touch sensor environment, be aware that excessive electrical noise
generated by the display may couple into the sensor and interfere with the controller signal-to-
noise-ratio which could cause reduced performance.
A projected capacitive sensor attached to the face of a display acts as a large capacitor coupling
LCD signals and adds capacitance to the sensor. The capacitor consists of 2 plates: one is the
face of the display and the other is the sensor. In addition, some displays exhibit varying
effective impedance to ground.
Displays should be equal to or larger than the installed sensor. Inadequately supported sensors
may be susceptible to mechanical bending. Note that, as the size of a sensor increases, it may
be more prone to mechanical distortions from touches. Such distortions could cause changes in
the stray capacitance and could affect touch performance. Pay particular attention to the
recommended spacing guidelines in the section of this manual titled "Attaching the Touch
Sensor to the Display".
Emissions
If radiated emissions are an issue in your integration, they may be reduced with one or a
combination of the following solutions.
• System design should enclose the controller in a metal casing connected to the chassis
ground.
• USB cabling from controller should terminate at USB housing with a grounded shield
connection.
• The use of a ferrite on the USB cable.
Note: Consult the display manufacturer to determine whether the original warranty will be
affected if you install the touch sensor. Also, determine who will recertify the display.
Certification will be necessary to comply with FCC class B and CE radiated and conducted
emissions regulations.
Mechanical Considerations
Tail Routing
Note: If you cannot avoid running the touch sensor tails near or over the backlight inverter or
power supply, try to run the tails underneath it. If possible, run the tails underneath the metal
shield. In some cases you may need to shield the wires or cables to ensure the noise does not
couple into the tails.
3M™ Multi-Touch PCT System Integration Guide 20
The touch sensor tails are not a handle. Never pick your sensor up by the tails. They are
electrical connections and are not designed for high stress.
Do not place constant stress on the tails during handling or integration. Do not expose the tails
to mechanical stresses because of the integration design. Provide adequate slack to ensure
there is no strain on the tails. Avoid lateral pulls that may overstress the outermost electrical
contacts on the glass. Be sure to tape tails in place.
The touch sensor tails should not move freely after assembly. Apply tape or another light
adhesive to secure the tails in a manner that does not apply stress to the tails.
Apply tape or other insulating material to sharp edges to protect the tails. Route the cable away
from sharp edges whenever possible. If this cannot be avoided, secure the tails so they do not
move.
Notes:
1. Do not cross over individual tails or allow them to touch – keep tails from overlapping.
2. The illustrations are meant to be representative. Your Product may look different. Reference
your marketing drawing or contact your 3M Touch Systems sales representative for more
information.
Note: 3M Touch Systems does not recommend metal touch sensor mounting brackets. If metal
sensor mounting brackets must be used, be sure to keep tail bends away. Make sure that all
metal brackets are grounded and not within the sensor’s active area.
Touch System Location
Keep in mind the optics of the touch sensor. Remember that different sources of light such as
outdoor (natural sunlight) and indoor (incandescent or fluorescent) can cause different effects
when viewing the sensor.
Remember that lighting changes over the course of a day and depends on weather. Consider
the brightness of an area and how it will affect readability of the computer display.
NOTICE: RF Emissions – To minimize the
potential for touch performance issues:
Do not overlap the tails or allow them to touch
one another. Provide gap of at least ¼” between
flex cable and controller components to eliminate
RF signal coupling from the PCB to flex cable.
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